What parts of an atom can change during a nuclear reaction that cannot change during a chemical reaction? Question 15 options: A. The number of protons and neutrons B. The number of electrons only C. The number of protons and electrons D. The number of neutrons and electrons

Answer:

Competing theories can be a source of new, testable ideas.

Explanation:

Theory is the set of knowledge that seeks to explain, with a high degree of accuracy, all-encompassing phenomena of nature, that is, it is different from the meaning of the word "theory" used in everyday life, when we say that something "is only a theory "in the sense that it is a mere speculation.

Competing theories present a much larger set of knowledge, which gives the universe a source of new and testable ideas

Answer:

Here is the answer. Hope this helps you!

Explanation:

Average velocity is the sum of initial and final velocity divided by 2. I t is the same as total Displacement divided by total time. Average velocity is calculated when the body is in non-uniform motion (also when total displacement and time is not given). The formula is as follows:

u + v/2 =

Average velocity = Average speed

during motion in a straight line. therefore, the above mentioned formula can be used for calculating average speed as well, when the direction is one and only the same, that is, during motion in a straight line. The S.I unit remains the same-

m/s.

Since velocity is vector, average VELOCITY is also vector. However, Average SPEED is scalar as speed is scalar. both can be equal only when the distance = displacement and when they are following the same direction of motion.